Area Forecast Discussion
Issued by NWS Pendleton, OR

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FXUS66 KPDT 200917
AFDPDT

Area Forecast Discussion
National Weather Service Pendleton OR
217 AM PDT Fri Apr 20 2018

.SHORT TERM...Today through Sunday...An upper level ridge will
move over WA and OR today. Expect increasing high clouds today as
moisture spills over the ridge. Temperatures will rapidly warm up
today. The ridge will flatten tonight as a shortwave and surface
cold front approaches from the northwest. The wave will clip the
area late Friday night and Saturday. Deep layer moisture will be
very limited and located mainly to the north of the area.
Precipitation will be mainly in the Cascades but orographic effects
may trigger a few showers in the NE OR mountains late tonight and
Saturday morning. The main effect of the system will be breezy to
windy conditions Saturday afternoon/evening. Dry zonal flow will
prevail Saturday night, with another weak short wave moving into the
Cascades Sunday afternoon. With very little moisture to work with,
dry conditions can be expected. Near normal high temperatures can be
expected for the weekend, with mild temperatures Friday night due to
more cloud cover overnight.  Coonfield

.LONG TERM...Sunday night through Friday...An upper trough will
linger over the forecast area Sunday evening and then exit out of
the area overnight into Monday morning. This will result in
improving weather with drier conditions. High pressure aloft will
move across the region on Monday and Tuesday while an upper low
pressure system develops well off the California coast. This will
result in dry and fair conditions with near to slightly above normal
temperatures. The long range models this far are in pretty good
agreement. After that things become more uncertain as the long range
models diverge from each other. As such did not make big changes
beyond Tuesday, and kept conditions mostly dry. There may be a
weather system moving in by late Friday, but there is too much
uncertainty to pinpoint the forecast that far out in the extended.
Overall temperatures will be near to slightly above normal with
lower elevation readings from the mid 60s to the mid 70s and
mostly light winds. 88

&&

.AVIATION...12Z TAFs...Fair weather with VFR conditions will prevail
for the next 24 hours at all TAF sites. There will be an approaching
weather system late tonight with increasing clouds, but
precipitation will be held west of the Cascades through the period.
Winds will be light today but then will increase gradually overnight
into Saturday morning. 88

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT  67  46  61  35 /   0  10   0   0
ALW  69  47  62  36 /   0  10  10   0
PSC  71  48  65  36 /   0  10   0   0
YKM  69  44  62  36 /   0  10  10   0
HRI  71  47  65  36 /   0  10   0   0
ELN  65  41  54  33 /   0  20  10   0
RDM  68  36  60  27 /   0  10   0   0
LGD  64  44  57  32 /   0  10  10   0
GCD  65  41  59  33 /   0  10   0   0
DLS  71  48  62  39 /   0  10  10   0

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...None.
WA...None.

&&

$$

76/88/88


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